Tay has grown up quite a bit since Chocolate Rain, and if you zip past the song, you see he gives his spin on what this song is about.
Two things strike me here.
One: I think "You're a Mean One, Mr. Grinch" is lyrically pretty self-explanatory.
Two: YouTube celebrities think we care about their opinions! Cute! Let's hope Tay campaigns for Sarah Palin in 2012.